Add raccoon peer to wireguard

It routes traffic from fox, apex and the compute nodes so that we can
reach the git servers and tent.

Reviewed-by: Aleix Boné <abonerib@bsc.es>

m/tent/configuration.nix

@@ -35,6 +35,7 @@
     defaultGateway = "10.0.44.1";
     hosts = {
       "84.88.53.236" = [ "apex" ];
+      "10.0.44.1" = [ "raccoon" ];
     };
   };